I have my guess but would like to know for sure

This desk was originaly bought with a heavy coat of dark brown varnish covering the woods natural detail. My father bought it at an auction in the mid 70's and it was used as a working desk by my Mom for a few years and then given to me where it has sat in my closet for all these years. I am in the midst of a career change and as part of a school project I took this desk out last month to restore it unkown to me that my dad was on his last few days in this existance. There are no cabinet maker marks on the wood but there was a large paper poster on the back side which got destroyed. There are numbers on the back side of the handles, more than likely model numers? I would appreciate it if anyone has a clue. Personally to me I get the feeling that it was a production pieces that went straight from the shop to some ones home. My guess is that it is one of the Stickleys brothers work but without that paper from the backside it is only a guess. Plus those holes on the back board really throw me off.

Good